The NTN Timing Belt Kit - 137771 is a comprehensive set of products designed to replace the timing belt in a car. It includes a timing belt, tensioner, idler pulley, water pump, and various other components necessary for a complete timing belt replacement. The kit also includes gaskets, seals, and hardware for proper installation. This kit is suitable for a variety of car models and provides all the necessary components for a smooth and efficient replacement of the timing belt. It is a convenient and cost-effective option for car owners looking to maintain the proper functioning of their vehicle's engine.